Improvement in bits for boring metals



'w. McCRDSSON.

Bit for Boring Met M s.

No. 159,948, Patented Feb.16,1875.-

:maz. vjrlaz'. T2161. 3.

WITNESSES INVENTOR THE GRAPHIC c0.PH01'0-L|TH.a9'&41 PARK PLAcaNM NI'IED STATES ATEN'I ()FFIGE.

WILLIAM MCGROSSON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO S. O. BAOHMAN, OF SAME PLACE.

IMPROVEMENT IN BITS FOR BORING METALS.

Specification forming part of Letters Patent No. 159,945, dated February 16, 1875 application filed December 24, 1874.

To all whom it may concern:

Be it known that I, WILLIAM MoORossoN, of the city and county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Bits, and I do hereby declare the following to be a clear and exact description of the nature thereof, sufficient to enable others skilled in the art to which my invention appertains to fully understand, make, and use the same, reference bein g had to the accompanying drawings, mak ing part of this specification, in which- Figures 1 and 3 are side views of the device embodying my invention. Fig. 2 is an edge View thereof. Fig. 4 is a view illustrating the operation of the tool.

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists in a bit which is serviceable for enlarging openings and cuttin g washers.

Referring to the drawings, A represents the body of the tool, and B the bottom cuttingedge thereof. 0 represents the point, which is arranged at one side of the lower end of said body A, and projects beyond the cutting edge B; but in order that the point 0 shall act as an axis, the body A is bent or extended laterally, as at b, so that the point 0 occupies the central position of the tool. The cuttingedge B extends from its outer end in an upwardly or diagonal direction. The point 0 enters an opening in the metal previously drilled, and guides the tool in its subsequent operation. When the outer end a of the diagonal cutting-edge B reaches the metal it cuts thereinto. As the tool advances and cuts through the metal a disk is removed from the latter equal to twice the width of the space of a line drawn from the center of the point (J to a perpendicular line let fall from the point a of the cutter B, whereby a large opening has been made, or there is an enlargementot the small opening previously produced, the removed disk constituting a washer. It Will also be seen that, by the point occupying a position at one side of the body A, the tool may be produced at a great swing of material'and time.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The improved drilling-tool herein described, the same consisting of the body A, with lat- .eral extension I), the guiding-point G at one side of the lower portion of the body, and a single cutting-edge, B, laterally thereto, said edge extending upwardly from the outer end a, all constructed and operating as set forth, and for the purpose specified.

WM. i MOOROSSON.

l'k. Witnesses ma SALLIE DUGAN, JOSEPHINE M. GRAHAM. 

